Development of Colorado Specific Safety Performance Functions (SPF’s) and Diagnostic Norms for Roundabouts

McCarthy, Gillian; Williams, Jim; Kononov, Jake; Kirby, Evan

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Development of Colorado Specific Safety Performance Functions (SPF’s) and Diagnostic Norms for Roundabouts

2024-10-01
By McCarthy, Gillian ; Williams, Jim ; Kononov, Jake ; ...

File Language:

English

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Creators:

McCarthy, Gillian ; Williams, Jim ; Kononov, Jake ; Kirby, Evan
Corporate Creators:

DiExSys, LLC
Corporate Contributors:

Colorado. Department of Transportation. Applied Research & Innovations Branch ; United States. Department of Transportation. Federal Highway Administration
Subject/TRT Terms:

Diagnostic Tests Evaluation Implementation Performance Roundabouts Safety
Publication/ Report Number:

CDOT-2024-13
Resource Type:

Tech Report
Geographical Coverage:

United States ; Colorado
Edition:

Final Report
Corporate Publisher:

Colorado. Dept. of Transportation. Applied Research and Innovation Branch
Abstract:

Roundabouts commonly replace intersections to reduce the number of conflict points, with the objective of crash reduction and better operations. They are becoming ever more popular in the United States. Many U.S. based research studies on the topic of roundabouts have focused on evaluating the effectiveness of converting existing intersections to roundabouts. This study was concerned with the development of Safety Performance Functions (SPFs) for Colorado roundabouts as well as diagnostics norms. Implementation: SPF models and diagnostic norms to evaluate safety performance using Colorado-specific crash prediction models for three roundabout facility types have been developed: Urban 3-leg 1-lane, 4-leg 1-lane, and 4-leg 2-lane. The models are ready for immediate use on safety projects by CDOT engineers. The products of this research will allow CDOT to more accurately quantify and evaluate the safety performance of Colorado roundabouts in a timely manner, assess design alternatives as part of future projects and overall make better investments of limited funding where maximizing safety is concerned.
Format:

PDF
Funding:

R322.01
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha-512:a6810ecacd1fd61d346d85cfaf98af1a0e44f73d13571d608fb61997b6f04053601229eba0a695ba8310dc628791d2fed9b883334c56c17541dbd313a6b4e324
Download URL:

https://rosap.ntl.bts.gov/view/dot/89055/dot_89055_DS1.pdf
File Type:

[PDF - 7.24 MB ]

File Language:

English

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